//package cluster
package main
import (
"encoding/csv"
"encoding/json"
"fmt"
"io"
"math/rand"
"net"
"os"
"strconv"
"time"
//"bytes"
)
const (
BROADCAST = -1
)
var outbox, inbox chan *Envelope
var pids [10]int
var ips [10]string
type Envelope struct {
Pid int
MsgId int64
Msg interface{}
}
type Server interface {
Pid() int
Peers() []int
Outbox() chan *Envelope
Inbox() chan *Envelope
}
/*
func (envelope Envelope) Pid() int {
return envelope.MsgId
}
*/
var server Envelope
func (envelope Envelope) Peers() []int {
return nil //pids
}
func (envelope Envelope) Outbox() chan *Envelope {
return outbox
}
func (envelope Envelope) Inbox() chan *Envelope {
return inbox
}
func server_() {
// listen on a port
ln, err := net.Listen("tcp", ":9999")
//time.Sleep(time.Second * 2)
if err != nil {
fmt.Println(err)
return
}
for {
c, err := ln.Accept()
if err != nil {
fmt.Println(err)
continue
} else {
fmt.Println("handle")
go handleServerConnection(c)
}
}
}
func handleServerConnection(c net.Conn) {
// receive the message
var msg Envelope
var b []byte
// for{
c.Read(b)
/*
if b == nil{
continue
}else{
break
}
*/
// }
fmt.Println(b)
err := json.Unmarshal(b, &msg)
if err != nil { //ERORR !!!!
fmt.Println(err)
} else {
fmt.Println("Received : %+v", msg)
}
c.Close()
}
func client() {
// connect to the server
for msg := range outbox {
c, err := net.Dial("tcp", "127.0.0.1:9999")
if err != nil {
fmt.Println(err)
return
}
if err != nil {
fmt.Println("error encoding the response to a join request")
fmt.Println(err)
}
b, _ := json.Marshal(msg)
fmt.Printf("the json: %s
", b)
c.Write(b)
c.Close()
}
time.Sleep(time.Second * 2)
}
func New(myPid int, ConFile string) Envelope {
inbox = make(chan *Envelope, 100)
outbox = make(chan *Envelope, 100)
file, err := os.Open(ConFile)
if err != nil {
fmt.Println("Error:", err)
}
defer file.Close()
reader := csv.NewReader(file)
i := 0
j := 0
for {
record, err := reader.Read()
if err == io.EOF {
break
} else if err != nil {
fmt.Println("Error:", err)
}
x, _ := strconv.Atoi(record[0])
pids[i] = x
i++
ips[j] = record[1]
j++
}
fmt.Println("
", ips)
fmt.Println("
", pids)
MsgId := rand.Int63n(0x10000000)
server = Envelope{Pid: myPid, MsgId: MsgId, Msg: "Hello World :)"}
go server_()
go client()
var input string
fmt.Println("
Press enter ---
")
fmt.Scanln(&input)
return server
}
func main() {
//for i := 1; i <= 10; i++ {
server := New(12, "config.txt")
server.Outbox() <- &Envelope{Pid: BROADCAST, MsgId: server.MsgId, Msg: "hello there"}
select {
case envelope := <-server.Inbox():
fmt.Printf("Received msg from %d: '%s'
", envelope.Pid, envelope.Msg)
case <-time.After(2 * time.Second):
println("Waited and waited. Ab thak gaya
")
}
//fmt.Println(server.Pid, server.MsgId, server.Msg )
//}
}
From client function I am trying to send some data but unable to receive data in handleServerConnection()
my program is written in go language help me out
I have referred most of the examples given in the book and stack overflow
i am getting an empty object in handleconnection function